does anyone know what the blue light is on the back of some stoplights?

Answer 1

It's for looks. From a distance, it makes the stop lights look pink or burgundy. It's an old school thing.

Answer 2

cameras they have been in the process of puttin cameras on stoplights to catch people that run red lights and any other crime that goes on at red lights it also helps catch people that are speedin

Answer 3

Probably a camera.

Answer 4

its like a diamond that people put on them for looks my dad use to put them on his they mostly put on older cars